Same problem here on 64 bit 7.10, Brother HL-5150D_series, quite
frustrating though as this did *not* fail until a recent update and some
hal/dbus updates I saw.  Perhaps the problem was fixed and now
regressed.  Will be trying the workaround mentioned in Peter T Hayward's
note.  Troubling because printing was so easy before, and this kind of
thing gets on my nerves quite a bit when the formerly slick and easy
becomes terribly broken, especially when one's art deadline is fast
approaching. :(

Seems that the udev configuration file is now 40-permissions.rules
(ordering) and the syntax is moving as well, with BUS being now the more
generic SUBSYSTEM

So, what worked for me... ahem:
SUBSYSTEM=="usb", KERNEL=="lp[0-9]", GROUP="lp"
becomes:
SUBSYSTEM=="usb", KERNEL=="lp[0-9]", GROUP="lp", MODE="0666"

Slightly newer udev and syntax seems to have bit me and maybe many other
users, but the effects are quite annoying, the printer will be
automatically discovered, added to cups configuration, and promptly
indicate readiness, and will defy any attempt to actually print until
you add the lp group add your user to lp group, and perform this
permissions modification followed by a sudo /etc/init.d/udev restart ;
sudo /etc/init.d/cupsys restart.  Status: /usr/lib/cups/backend/hal
failed is replaced with Status: Ready:

Quality control wrt printing is essential, as users get a big throbbing
frustration when their printing subsystem dies because of what seems to
be a trivial update of core system services.  This made ubuntu look bad
in front of my pen and paper gaming group, who could formerly print
character sheets, and various other nerd etceterata from their windows
machines to my box with minimal trouble, and now had to lug their
laptops up to my room to attach usb cabling manually.

-- 
7.10 /usr/lib/cups/backend/hal failed
https://bugs.launchpad.net/bugs/174403
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